public class TryCatch extends Expression
| Modifier and Type | Class and Description |
|---|---|
static class |
TryCatch.CatchClause |
EFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, EVENT_FEED_METHOD, INHERITED_CONTEXT, INSPECTION_CONTEXT, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, NAVIGATION_CONTEXT, NODE_VALUE_CONTEXT, PROCESS_METHOD, PUSH_SELECTION, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, W3C_CONSUMING, W3C_FREE_RANGING, W3C_GROUP_CONSUMING, W3C_MOTIONLESS, WATCH_METHOD| Constructor and Description |
|---|
TryCatch(Expression tryExpr) |
| Modifier and Type | Method and Description |
|---|---|
void |
addCatchExpression(QNameTest test,
Expression catchExpr) |
int |
computeCardinality()
Determine the cardinality of the function.
|
Expression |
copy()
Copy an expression.
|
Item |
evaluateItem(XPathContext c)
Evaluate as a singleton item
|
void |
explain(ExpressionPresenter out)
Diagnostic print of expression structure.
|
List<TryCatch.CatchClause> |
getCatchClauses()
Get the list of catch clauses
|
ExpressionCompiler |
getExpressionCompiler()
Return the compiler of the TryCatch expression
|
String |
getExpressionName()
Get a name identifying the kind of expression, in terms meaningful to a user.
|
ItemType |
getItemType(TypeHierarchy th)
Determine the item type of the value returned by the function
|
Expression |
getTryExpr()
Get the "try" expression
|
SequenceIterator<? extends Item> |
iterate(XPathContext c)
Iterate over the results of the function
|
Iterator<SubExpressionInfo> |
iterateSubExpressionInfo()
Get the immediate sub-expressions of this expression, with information about the relationship
of each expression to its parent expression.
|
Iterator<Expression> |
iterateSubExpressions()
Get the immediate sub-expressions of this expression.
|
Expression |
promote(PromotionOffer offer,
Expression parent)
Offer promotion for this subexpression.
|
boolean |
replaceSubExpression(Expression original,
Expression replacement)
Replace one subexpression by a replacement subexpression
|
Expression |
simplify(ExpressionVisitor visitor)
Simplify an expression.
|
Expression |
typeCheck(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Perform type checking of an expression and its subexpressions.
|
addToPathMap, adoptChildExpression, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeSpecialProperties, computeStaticProperties, doPromotion, dynamicError, effectiveBooleanValue, evaluateAsString, evaluatePendingUpdates, explain, getCardinality, getColumnNumber, getColumnNumber, getConstructType, getContainer, getDependencies, getEvaluationMethod, getExecutable, getHostLanguage, getImplementationMethod, getIntegerBounds, getIntrinsicDependencies, getLineNumber, getLineNumber, getLocationId, getLocationProvider, getObjectName, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getStreamability, getStreamingAdjunct, getSystemId, getSystemId, hasVariableBinding, implementsStaticTypeCheck, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, iterateEvents, markTailFunctionCalls, optimize, process, resetLocalStaticProperties, setContainer, setEvaluationMethod, setFiltered, setFlattened, setLocationId, staticTypeCheck, suppressValidation, toPattern, toStreamingPattern, toString, typeErrorpublic TryCatch(Expression tryExpr)
public void addCatchExpression(QNameTest test, Expression catchExpr)
public Expression simplify(ExpressionVisitor visitor) throws XPathException
Expressionsimplify in class Expressionvisitor - an expression visitorXPathException - if an error is discovered during expression
rewritingpublic Expression getTryExpr()
public List<TryCatch.CatchClause> getCatchClauses()
public int computeCardinality()
computeCardinality in class ExpressionStaticProperty.ALLOWS_ZERO_OR_ONE,
StaticProperty.EXACTLY_ONE, StaticProperty.ALLOWS_ONE_OR_MORE,
StaticProperty.ALLOWS_ZERO_OR_MOREpublic ItemType getItemType(TypeHierarchy th)
getItemType in class Expressionth - the type hierarchy cachepublic Expression typeCheck(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
This checks statically that the operands of the expression have the correct type; if necessary it generates code to do run-time type checking or type conversion. A static type error is reported only if execution cannot possibly succeed, that is, if a run-time type error is inevitable. The call may return a modified form of the expression.
This method is called after all references to functions and variables have been resolved to the declaration of the function or variable. However, the types of such functions and variables may not be accurately known if they have not been explicitly declared.
If the implementation returns a value other than "this", then it is required to ensure that the location information in the returned expression have been set up correctly. It should not rely on the caller to do this, although for historical reasons many callers do so.
typeCheck in class Expressionvisitor - an expression visitorcontextItemType - the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPEXPathException - if an error is discovered during this phase
(typically a type error)public Iterator<Expression> iterateSubExpressions()
iterateSubExpressions in class Expressionpublic Iterator<SubExpressionInfo> iterateSubExpressionInfo()
iterateSubExpressionInfo in class Expressionpublic Expression promote(PromotionOffer offer, Expression parent) throws XPathException
This method must be overridden for any Expression that has subexpressions.
promote in class Expressionoffer - details of the offer, for example the offer to move
expressions that don't depend on the context to an outer level in
the containing expressionparent - the parent of the current expressionXPathException - if any error is detectedpublic boolean replaceSubExpression(Expression original, Expression replacement)
replaceSubExpression in class Expressionoriginal - the original subexpressionreplacement - the replacement subexpressionpublic Expression copy()
copy in class Expressionpublic Item evaluateItem(XPathContext c) throws XPathException
evaluateItem in class Expressionc - the dynamic XPath evaluation contextXPathException - if any dynamic error occurs evaluating the
expressionpublic SequenceIterator<? extends Item> iterate(XPathContext c) throws XPathException
iterate in class Expressionc - supplies the context for evaluationXPathException - if any dynamic error occurs evaluating the
expressionpublic String getExpressionName()
getExpressionName in class Expressionpublic void explain(ExpressionPresenter out)
explain in class Expressionout - the expression presenter used to display the structurepublic ExpressionCompiler getExpressionCompiler()
getExpressionCompiler in class ExpressionCopyright (c) 2004-2013 Saxonica Limited. All rights reserved.